Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange


A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

× 27
For questions relating to quantum chemistry using wavefunction-based methods and solving the Schrödinger equation.
× 41
a physical or chemical phenomenon or a process in which atoms, molecules or ions enter some bulk phase – gas, liquid or solid material.
× 2083
should be applied to questions concerning acid and base reactions. An acid is capable of donating a hydron/ proton (Brønsted acid) or capable of forming a covalent bond with an electron pair …
× 14
Adhesion refers to the attractive forces that exist between two materials. Questions that are based on these attraction forces, e.g: surface tension, contact angle, capillary rise, should use this tag…
× 73
The adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface.
× 340
For questions about saturated and unsaturated alcohols, their physical properties, their reactions, etc. For questions about phenol, use the [phenols] tag instead.
× 34
should be applied to questions about mechanisms, selectivity, or other aspects of aldol reactions.
× 10
For questions about the alkali metals (group 1), their compounds, and their physical and chemical properties. For questions specifically about hydrogen, use tag [hydrogen] instead.
× 7
For questions about the alkaline earth metals (group 2), their compounds, and their physical and chemical properties.
× 22
Different forms of an element which exist in the same state but have different molecular or crystalline structures. Classic examples of allotropes include diamond and graphite (allotropes of carbon), …
× 66
For questions about alloys.
× 5
× 189
For questions about amines - organic compounds with a basic nitrogen with a lone pair, also occasionally referred to as derivatives of ammonia. Not to be confused with amides, for which the tag [carbo…
× 59
for questions about amino acids, both natural and non-natural ones. It should only be applied to questions about the monomers. For peptides and proteins, use the proteins tag instead.
× 593
The branch of chemistry concerned with identifying and quantifying the chemical constituents of matter.
× 82
Chemical processes and theories being used in practical and experimental applications.
× 752
For questions relating to compounds dissolved in water and resulting reactions.
× 573
For questions about the properties and reactions of aromatic compounds. This tag should also be applied to antiaromatic compounds. This tag should not be applied to general questions about resonance, …
× 80
For questions about the concept of aromaticity. Do not use for reactions of aromatic compounds.
× 18
Chemistry occurring on asteroids, comets, in the interstellar medium or on other planets.
× 62
Chemical reactions that occur in the atmosphere of Earth and other planets. Relevant reactions include both those that take place only in the gas-phase, in the solid or liquid phases of aerosols or a…
× 86
For questions about the atomic radius - a measure of the size of an atom, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding "cloud" of electrons.
× 46
For questions about the various atomic structure theories, including the Bohr theory. Not to be confused with the actual arrangement of atoms in macroscopic solids ([solid-state-chemistry]) or newer q…
× 374
Smallest particle still characterizing a chemical element. It consists of a small nucleus charged positively, carrying almost all of the atom's mass, with electrons surrounding it. This tag should be…
× 38
A set of (basis) functions make up a basis set. These functions (generally) represent atomic orbitals whose linear combinations are used to make molecular orbitals (LCAO-MO) in computational chemistr…
× 9
Also known as banana bond. These kinds of bonds are usually found in small, strained, organic molecules. The simplification of the hybridisation scheme fails for this class of compounds.
× 682
for questions concerning biochemical methods (e.g. electrophoresis) or those concerning biochemical mechanisms or research. Do not use this tag if your question is merely about compounds o…
× 197
the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid
× 966
For questions about chemical bonds (ionic/covalent/etc.), their properties (length, energy, angle, etc.) or their relation to other molecular properties (intermolecular forces/dipole moment/etc.). Do …
× 46
about scientific books, and/or scientific literature in general. Maybe especially useful in combination with reference-request or textbook-erratum.